]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <netinet/in.h> | |
22 | #include <stdbool.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include "sd-netlink.h" | |
26 | ||
27 | #include "alloc-util.h" | |
28 | #include "format-util.h" | |
29 | #include "missing.h" | |
30 | #include "netlink-internal.h" | |
31 | #include "netlink-types.h" | |
32 | #include "netlink-util.h" | |
33 | #include "refcnt.h" | |
34 | #include "socket-util.h" | |
35 | #include "util.h" | |
36 | ||
37 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL) | |
38 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; | |
39 | ||
40 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) | |
41 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) | |
42 | ||
43 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { | |
44 | sd_netlink_message *m; | |
45 | ||
46 | assert_return(ret, -EINVAL); | |
47 | ||
48 | /* Note that 'rtnl' is currently unused, if we start using it internally | |
49 | we must take care to avoid problems due to mutual references between | |
50 | buses and their queued messages. See sd-bus. | |
51 | */ | |
52 | ||
53 | m = new0(sd_netlink_message, 1); | |
54 | if (!m) | |
55 | return -ENOMEM; | |
56 | ||
57 | m->n_ref = REFCNT_INIT; | |
58 | ||
59 | m->sealed = false; | |
60 | ||
61 | *ret = m; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { | |
67 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; | |
68 | const NLType *nl_type; | |
69 | size_t size; | |
70 | int r; | |
71 | ||
72 | r = type_system_get_type(&type_system_root, &nl_type, type); | |
73 | if (r < 0) | |
74 | return r; | |
75 | ||
76 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) | |
77 | return -EINVAL; | |
78 | ||
79 | r = message_new_empty(rtnl, &m); | |
80 | if (r < 0) | |
81 | return r; | |
82 | ||
83 | size = NLMSG_SPACE(type_get_size(nl_type)); | |
84 | ||
85 | assert(size >= sizeof(struct nlmsghdr)); | |
86 | m->hdr = malloc0(size); | |
87 | if (!m->hdr) | |
88 | return -ENOMEM; | |
89 | ||
90 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
91 | ||
92 | type_get_type_system(nl_type, &m->containers[0].type_system); | |
93 | m->hdr->nlmsg_len = size; | |
94 | m->hdr->nlmsg_type = type; | |
95 | ||
96 | *ret = m; | |
97 | m = NULL; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { | |
103 | assert_return(m, -EINVAL); | |
104 | assert_return(m->hdr, -EINVAL); | |
105 | ||
106 | assert_return(IN_SET(m->hdr->nlmsg_type, RTM_GETLINK, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, RTM_GETRULE, RTM_GETADDRLABEL), -EINVAL); | |
107 | ||
108 | SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { | |
114 | if (m) | |
115 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
116 | ||
117 | return m; | |
118 | } | |
119 | ||
120 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { | |
121 | sd_netlink_message *t; | |
122 | ||
123 | while (m && REFCNT_DEC(m->n_ref) == 0) { | |
124 | unsigned i; | |
125 | ||
126 | free(m->hdr); | |
127 | ||
128 | for (i = 0; i <= m->n_containers; i++) | |
129 | free(m->containers[i].attributes); | |
130 | ||
131 | t = m; | |
132 | m = m->next; | |
133 | free(t); | |
134 | } | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
139 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { | |
140 | assert_return(m, -EINVAL); | |
141 | assert_return(type, -EINVAL); | |
142 | ||
143 | *type = m->hdr->nlmsg_type; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) { | |
149 | assert_return(m, -EINVAL); | |
150 | assert_return(flags, -EINVAL); | |
151 | ||
152 | m->hdr->nlmsg_flags = flags; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { | |
158 | assert_return(m, -EINVAL); | |
159 | ||
160 | return m->broadcast; | |
161 | } | |
162 | ||
163 | /* If successful the updated message will be correctly aligned, if | |
164 | unsuccessful the old message is untouched. */ | |
165 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { | |
166 | uint32_t rta_length; | |
167 | size_t message_length, padding_length; | |
168 | struct nlmsghdr *new_hdr; | |
169 | struct rtattr *rta; | |
170 | char *padding; | |
171 | unsigned i; | |
172 | int offset; | |
173 | ||
174 | assert(m); | |
175 | assert(m->hdr); | |
176 | assert(!m->sealed); | |
177 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); | |
178 | assert(!data || data_length); | |
179 | ||
180 | /* get offset of the new attribute */ | |
181 | offset = m->hdr->nlmsg_len; | |
182 | ||
183 | /* get the size of the new rta attribute (with padding at the end) */ | |
184 | rta_length = RTA_LENGTH(data_length); | |
185 | ||
186 | /* get the new message size (with padding at the end) */ | |
187 | message_length = offset + RTA_ALIGN(rta_length); | |
188 | ||
189 | /* realloc to fit the new attribute */ | |
190 | new_hdr = realloc(m->hdr, message_length); | |
191 | if (!new_hdr) | |
192 | return -ENOMEM; | |
193 | m->hdr = new_hdr; | |
194 | ||
195 | /* get pointer to the attribute we are about to add */ | |
196 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); | |
197 | ||
198 | /* if we are inside containers, extend them */ | |
199 | for (i = 0; i < m->n_containers; i++) | |
200 | GET_CONTAINER(m, i)->rta_len += message_length - offset; | |
201 | ||
202 | /* fill in the attribute */ | |
203 | rta->rta_type = type; | |
204 | rta->rta_len = rta_length; | |
205 | if (data) | |
206 | /* we don't deal with the case where the user lies about the type | |
207 | * and gives us too little data (so don't do that) | |
208 | */ | |
209 | padding = mempcpy(RTA_DATA(rta), data, data_length); | |
210 | ||
211 | else | |
212 | /* if no data was passed, make sure we still initialize the padding | |
213 | note that we can have data_length > 0 (used by some containers) */ | |
214 | padding = RTA_DATA(rta); | |
215 | ||
216 | /* make sure also the padding at the end of the message is initialized */ | |
217 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
218 | memzero(padding, padding_length); | |
219 | ||
220 | /* update message size */ | |
221 | m->hdr->nlmsg_len = message_length; | |
222 | ||
223 | return offset; | |
224 | } | |
225 | ||
226 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { | |
227 | const NLType *type; | |
228 | int r; | |
229 | ||
230 | assert(m); | |
231 | ||
232 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | if (type_get_type(type) != data_type) | |
237 | return -EINVAL; | |
238 | ||
239 | if (out_size) | |
240 | *out_size = type_get_size(type); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { | |
245 | size_t length, size; | |
246 | int r; | |
247 | ||
248 | assert_return(m, -EINVAL); | |
249 | assert_return(!m->sealed, -EPERM); | |
250 | assert_return(data, -EINVAL); | |
251 | ||
252 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); | |
253 | if (r < 0) | |
254 | return r; | |
255 | ||
256 | if (size) { | |
257 | length = strnlen(data, size+1); | |
258 | if (length > size) | |
259 | return -EINVAL; | |
260 | } else | |
261 | length = strlen(data); | |
262 | ||
263 | r = add_rtattr(m, type, data, length + 1); | |
264 | if (r < 0) | |
265 | return r; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { | |
271 | size_t size; | |
272 | int r; | |
273 | ||
274 | assert_return(m, -EINVAL); | |
275 | assert_return(!m->sealed, -EPERM); | |
276 | ||
277 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
278 | if (r < 0) | |
279 | return r; | |
280 | ||
281 | r = add_rtattr(m, type, NULL, 0); | |
282 | if (r < 0) | |
283 | return r; | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { | |
289 | int r; | |
290 | ||
291 | assert_return(m, -EINVAL); | |
292 | assert_return(!m->sealed, -EPERM); | |
293 | ||
294 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
295 | if (r < 0) | |
296 | return r; | |
297 | ||
298 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); | |
299 | if (r < 0) | |
300 | return r; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | ||
306 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { | |
307 | int r; | |
308 | ||
309 | assert_return(m, -EINVAL); | |
310 | assert_return(!m->sealed, -EPERM); | |
311 | ||
312 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
313 | if (r < 0) | |
314 | return r; | |
315 | ||
316 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); | |
317 | if (r < 0) | |
318 | return r; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { | |
324 | int r; | |
325 | ||
326 | assert_return(m, -EINVAL); | |
327 | assert_return(!m->sealed, -EPERM); | |
328 | ||
329 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
330 | if (r < 0) | |
331 | return r; | |
332 | ||
333 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); | |
334 | if (r < 0) | |
335 | return r; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) { | |
341 | int r; | |
342 | ||
343 | assert_return(m, -EINVAL); | |
344 | assert_return(!m->sealed, -EPERM); | |
345 | ||
346 | r = add_rtattr(m, type, data, len); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { | |
354 | int r; | |
355 | ||
356 | assert_return(m, -EINVAL); | |
357 | assert_return(!m->sealed, -EPERM); | |
358 | assert_return(data, -EINVAL); | |
359 | ||
360 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
361 | if (r < 0) | |
362 | return r; | |
363 | ||
364 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); | |
365 | if (r < 0) | |
366 | return r; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { | |
372 | int r; | |
373 | ||
374 | assert_return(m, -EINVAL); | |
375 | assert_return(!m->sealed, -EPERM); | |
376 | assert_return(data, -EINVAL); | |
377 | ||
378 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
379 | if (r < 0) | |
380 | return r; | |
381 | ||
382 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); | |
383 | if (r < 0) | |
384 | return r; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { | |
390 | int r; | |
391 | ||
392 | assert_return(m, -EINVAL); | |
393 | assert_return(!m->sealed, -EPERM); | |
394 | assert_return(data, -EINVAL); | |
395 | ||
396 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
397 | if (r < 0) | |
398 | return r; | |
399 | ||
400 | r = add_rtattr(m, type, data, ETH_ALEN); | |
401 | if (r < 0) | |
402 | return r; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { | |
408 | int r; | |
409 | ||
410 | assert_return(m, -EINVAL); | |
411 | assert_return(!m->sealed, -EPERM); | |
412 | assert_return(info, -EINVAL); | |
413 | ||
414 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
415 | if (r < 0) | |
416 | return r; | |
417 | ||
418 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
419 | if (r < 0) | |
420 | return r; | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { | |
426 | size_t size; | |
427 | int r; | |
428 | ||
429 | assert_return(m, -EINVAL); | |
430 | assert_return(!m->sealed, -EPERM); | |
431 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); | |
432 | ||
433 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); | |
434 | if (r < 0) { | |
435 | const NLTypeSystemUnion *type_system_union; | |
436 | int family; | |
437 | ||
438 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); | |
439 | if (r < 0) | |
440 | return r; | |
441 | ||
442 | r = sd_rtnl_message_get_family(m, &family); | |
443 | if (r < 0) | |
444 | return r; | |
445 | ||
446 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); | |
447 | if (r < 0) | |
448 | return r; | |
449 | ||
450 | r = type_system_union_protocol_get_type_system(type_system_union, | |
451 | &m->containers[m->n_containers + 1].type_system, | |
452 | family); | |
453 | if (r < 0) | |
454 | return r; | |
455 | } else { | |
456 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, | |
457 | &m->containers[m->n_containers + 1].type_system, | |
458 | type); | |
459 | if (r < 0) | |
460 | return r; | |
461 | } | |
462 | ||
463 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); | |
464 | if (r < 0) | |
465 | return r; | |
466 | ||
467 | m->containers[m->n_containers++].offset = r; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { | |
473 | const NLTypeSystemUnion *type_system_union; | |
474 | int r; | |
475 | ||
476 | assert_return(m, -EINVAL); | |
477 | assert_return(!m->sealed, -EPERM); | |
478 | ||
479 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); | |
480 | if (r < 0) | |
481 | return r; | |
482 | ||
483 | r = type_system_union_get_type_system(type_system_union, | |
484 | &m->containers[m->n_containers + 1].type_system, | |
485 | key); | |
486 | if (r < 0) | |
487 | return r; | |
488 | ||
489 | r = sd_netlink_message_append_string(m, type_system_union->match, key); | |
490 | if (r < 0) | |
491 | return r; | |
492 | ||
493 | /* do we evere need non-null size */ | |
494 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
495 | if (r < 0) | |
496 | return r; | |
497 | ||
498 | m->containers[m->n_containers++].offset = r; | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | ||
504 | int sd_netlink_message_close_container(sd_netlink_message *m) { | |
505 | assert_return(m, -EINVAL); | |
506 | assert_return(!m->sealed, -EPERM); | |
507 | assert_return(m->n_containers > 0, -EINVAL); | |
508 | ||
509 | m->containers[m->n_containers].type_system = NULL; | |
510 | m->n_containers--; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { | |
516 | struct netlink_attribute *attribute; | |
517 | struct rtattr *rta; | |
518 | ||
519 | assert_return(m, -EINVAL); | |
520 | assert_return(m->sealed, -EPERM); | |
521 | assert_return(data, -EINVAL); | |
522 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); | |
523 | assert(m->containers[m->n_containers].attributes); | |
524 | assert(type < m->containers[m->n_containers].n_attributes); | |
525 | ||
526 | attribute = &m->containers[m->n_containers].attributes[type]; | |
527 | ||
528 | if (!attribute->offset) | |
529 | return -ENODATA; | |
530 | ||
531 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); | |
532 | ||
533 | *data = RTA_DATA(rta); | |
534 | ||
535 | if (net_byteorder) | |
536 | *net_byteorder = attribute->net_byteorder; | |
537 | ||
538 | return RTA_PAYLOAD(rta); | |
539 | } | |
540 | ||
541 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { | |
542 | int r; | |
543 | void *attr_data; | |
544 | ||
545 | assert_return(m, -EINVAL); | |
546 | ||
547 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); | |
548 | if (r < 0) | |
549 | return r; | |
550 | ||
551 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
552 | if (r < 0) | |
553 | return r; | |
554 | else if (strnlen(attr_data, r) >= (size_t) r) | |
555 | return -EIO; | |
556 | ||
557 | if (data) | |
558 | *data = (const char *) attr_data; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { | |
564 | int r; | |
565 | void *attr_data; | |
566 | ||
567 | assert_return(m, -EINVAL); | |
568 | ||
569 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
570 | if (r < 0) | |
571 | return r; | |
572 | ||
573 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
574 | if (r < 0) | |
575 | return r; | |
576 | else if ((size_t) r < sizeof(uint8_t)) | |
577 | return -EIO; | |
578 | ||
579 | if (data) | |
580 | *data = *(uint8_t *) attr_data; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { | |
586 | void *attr_data; | |
587 | bool net_byteorder; | |
588 | int r; | |
589 | ||
590 | assert_return(m, -EINVAL); | |
591 | ||
592 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); | |
597 | if (r < 0) | |
598 | return r; | |
599 | else if ((size_t) r < sizeof(uint16_t)) | |
600 | return -EIO; | |
601 | ||
602 | if (data) { | |
603 | if (net_byteorder) | |
604 | *data = be16toh(*(uint16_t *) attr_data); | |
605 | else | |
606 | *data = *(uint16_t *) attr_data; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { | |
613 | void *attr_data; | |
614 | bool net_byteorder; | |
615 | int r; | |
616 | ||
617 | assert_return(m, -EINVAL); | |
618 | ||
619 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); | |
624 | if (r < 0) | |
625 | return r; | |
626 | else if ((size_t)r < sizeof(uint32_t)) | |
627 | return -EIO; | |
628 | ||
629 | if (data) { | |
630 | if (net_byteorder) | |
631 | *data = be32toh(*(uint32_t *) attr_data); | |
632 | else | |
633 | *data = *(uint32_t *) attr_data; | |
634 | } | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { | |
640 | int r; | |
641 | void *attr_data; | |
642 | ||
643 | assert_return(m, -EINVAL); | |
644 | ||
645 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
646 | if (r < 0) | |
647 | return r; | |
648 | ||
649 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
650 | if (r < 0) | |
651 | return r; | |
652 | else if ((size_t)r < sizeof(struct ether_addr)) | |
653 | return -EIO; | |
654 | ||
655 | if (data) | |
656 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { | |
662 | int r; | |
663 | void *attr_data; | |
664 | ||
665 | assert_return(m, -EINVAL); | |
666 | ||
667 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
668 | if (r < 0) | |
669 | return r; | |
670 | ||
671 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
672 | if (r < 0) | |
673 | return r; | |
674 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
675 | return -EIO; | |
676 | ||
677 | if (info) | |
678 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { | |
684 | int r; | |
685 | void *attr_data; | |
686 | ||
687 | assert_return(m, -EINVAL); | |
688 | ||
689 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
690 | if (r < 0) | |
691 | return r; | |
692 | ||
693 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
694 | if (r < 0) | |
695 | return r; | |
696 | else if ((size_t)r < sizeof(struct in_addr)) | |
697 | return -EIO; | |
698 | ||
699 | if (data) | |
700 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { | |
706 | int r; | |
707 | void *attr_data; | |
708 | ||
709 | assert_return(m, -EINVAL); | |
710 | ||
711 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
712 | if (r < 0) | |
713 | return r; | |
714 | ||
715 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
716 | if (r < 0) | |
717 | return r; | |
718 | else if ((size_t)r < sizeof(struct in6_addr)) | |
719 | return -EIO; | |
720 | ||
721 | if (data) | |
722 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
727 | static int netlink_container_parse(sd_netlink_message *m, | |
728 | struct netlink_container *container, | |
729 | int count, | |
730 | struct rtattr *rta, | |
731 | unsigned int rt_len) { | |
732 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
733 | ||
734 | attributes = new0(struct netlink_attribute, count); | |
735 | if (!attributes) | |
736 | return -ENOMEM; | |
737 | ||
738 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
739 | unsigned short type; | |
740 | ||
741 | type = RTA_TYPE(rta); | |
742 | ||
743 | /* if the kernel is newer than the headers we used | |
744 | when building, we ignore out-of-range attributes */ | |
745 | if (type >= count) | |
746 | continue; | |
747 | ||
748 | if (attributes[type].offset) | |
749 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
750 | ||
751 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; | |
752 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; | |
753 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
754 | } | |
755 | ||
756 | container->attributes = attributes; | |
757 | attributes = NULL; | |
758 | container->n_attributes = count; | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { | |
764 | const NLType *nl_type; | |
765 | const NLTypeSystem *type_system; | |
766 | void *container; | |
767 | uint16_t type; | |
768 | size_t size; | |
769 | int r; | |
770 | ||
771 | assert_return(m, -EINVAL); | |
772 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
773 | ||
774 | r = type_system_get_type(m->containers[m->n_containers].type_system, | |
775 | &nl_type, | |
776 | type_id); | |
777 | if (r < 0) | |
778 | return r; | |
779 | ||
780 | type = type_get_type(nl_type); | |
781 | ||
782 | if (type == NETLINK_TYPE_NESTED) { | |
783 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, | |
784 | &type_system, | |
785 | type_id); | |
786 | if (r < 0) | |
787 | return r; | |
788 | } else if (type == NETLINK_TYPE_UNION) { | |
789 | const NLTypeSystemUnion *type_system_union; | |
790 | ||
791 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, | |
792 | &type_system_union, | |
793 | type_id); | |
794 | if (r < 0) | |
795 | return r; | |
796 | ||
797 | switch (type_system_union->match_type) { | |
798 | case NL_MATCH_SIBLING: | |
799 | { | |
800 | const char *key; | |
801 | ||
802 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); | |
803 | if (r < 0) | |
804 | return r; | |
805 | ||
806 | r = type_system_union_get_type_system(type_system_union, | |
807 | &type_system, | |
808 | key); | |
809 | if (r < 0) | |
810 | return r; | |
811 | ||
812 | break; | |
813 | } | |
814 | case NL_MATCH_PROTOCOL: | |
815 | { | |
816 | int family; | |
817 | ||
818 | r = sd_rtnl_message_get_family(m, &family); | |
819 | if (r < 0) | |
820 | return r; | |
821 | ||
822 | r = type_system_union_protocol_get_type_system(type_system_union, | |
823 | &type_system, | |
824 | family); | |
825 | if (r < 0) | |
826 | return r; | |
827 | ||
828 | break; | |
829 | } | |
830 | default: | |
831 | assert_not_reached("sd-netlink: invalid type system union type"); | |
832 | } | |
833 | } else | |
834 | return -EINVAL; | |
835 | ||
836 | r = netlink_message_read_internal(m, type_id, &container, NULL); | |
837 | if (r < 0) | |
838 | return r; | |
839 | else | |
840 | size = (size_t)r; | |
841 | ||
842 | m->n_containers++; | |
843 | ||
844 | r = netlink_container_parse(m, | |
845 | &m->containers[m->n_containers], | |
846 | type_system_get_count(type_system), | |
847 | container, | |
848 | size); | |
849 | if (r < 0) { | |
850 | m->n_containers--; | |
851 | return r; | |
852 | } | |
853 | ||
854 | m->containers[m->n_containers].type_system = type_system; | |
855 | ||
856 | return 0; | |
857 | } | |
858 | ||
859 | int sd_netlink_message_exit_container(sd_netlink_message *m) { | |
860 | assert_return(m, -EINVAL); | |
861 | assert_return(m->sealed, -EINVAL); | |
862 | assert_return(m->n_containers > 0, -EINVAL); | |
863 | ||
864 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); | |
865 | m->containers[m->n_containers].type_system = NULL; | |
866 | ||
867 | m->n_containers--; | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { | |
873 | assert(m); | |
874 | assert(m->hdr); | |
875 | ||
876 | return m->hdr->nlmsg_seq; | |
877 | } | |
878 | ||
879 | int sd_netlink_message_is_error(sd_netlink_message *m) { | |
880 | assert_return(m, 0); | |
881 | assert_return(m->hdr, 0); | |
882 | ||
883 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
884 | } | |
885 | ||
886 | int sd_netlink_message_get_errno(sd_netlink_message *m) { | |
887 | struct nlmsgerr *err; | |
888 | ||
889 | assert_return(m, -EINVAL); | |
890 | assert_return(m->hdr, -EINVAL); | |
891 | ||
892 | if (!sd_netlink_message_is_error(m)) | |
893 | return 0; | |
894 | ||
895 | err = NLMSG_DATA(m->hdr); | |
896 | ||
897 | return err->error; | |
898 | } | |
899 | ||
900 | int sd_netlink_message_rewind(sd_netlink_message *m) { | |
901 | const NLType *nl_type; | |
902 | uint16_t type; | |
903 | size_t size; | |
904 | unsigned i; | |
905 | int r; | |
906 | ||
907 | assert_return(m, -EINVAL); | |
908 | ||
909 | /* don't allow appending to message once parsed */ | |
910 | if (!m->sealed) | |
911 | rtnl_message_seal(m); | |
912 | ||
913 | for (i = 1; i <= m->n_containers; i++) | |
914 | m->containers[i].attributes = mfree(m->containers[i].attributes); | |
915 | ||
916 | m->n_containers = 0; | |
917 | ||
918 | if (m->containers[0].attributes) | |
919 | /* top-level attributes have already been parsed */ | |
920 | return 0; | |
921 | ||
922 | assert(m->hdr); | |
923 | ||
924 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); | |
925 | if (r < 0) | |
926 | return r; | |
927 | ||
928 | type = type_get_type(nl_type); | |
929 | size = type_get_size(nl_type); | |
930 | ||
931 | if (type == NETLINK_TYPE_NESTED) { | |
932 | const NLTypeSystem *type_system; | |
933 | ||
934 | type_get_type_system(nl_type, &type_system); | |
935 | ||
936 | m->containers[0].type_system = type_system; | |
937 | ||
938 | r = netlink_container_parse(m, | |
939 | &m->containers[m->n_containers], | |
940 | type_system_get_count(type_system), | |
941 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
942 | NLMSG_PAYLOAD(m->hdr, size)); | |
943 | if (r < 0) | |
944 | return r; | |
945 | } | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | void rtnl_message_seal(sd_netlink_message *m) { | |
951 | assert(m); | |
952 | assert(!m->sealed); | |
953 | ||
954 | m->sealed = true; | |
955 | } | |
956 | ||
957 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { | |
958 | assert_return(m, NULL); | |
959 | ||
960 | return m->next; | |
961 | } |